222221211212221 has 16 divisors (see below), whose sum is σ = 242724324304000. Its totient is φ = 202224036535488.

The previous prime is 222221211212179. The next prime is 222221211212249. The reversal of 222221211212221 is 122212112122222.

It is a cyclic number.

It is not a de Polignac number, because 222221211212221 - 2⁴⁵ = 187036839123389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221211215221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 393751011 + ... + 394314976.

It is an arithmetic number, because the mean of its divisors is an integer number (15170270269000).

Almost surely, 2^{222221211212221} is an apocalyptic number.

It is an amenable number.

222221211212221 is a deficient number, since it is larger than the sum of its proper divisors (20503113091779).

222221211212221 is a wasteful number, since it uses less digits than its factorization.

222221211212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788066308.

The product of its digits is 1024, while the sum is 25.

Adding to 222221211212221 its reverse (122212112122222), we get a palindrome (344433323334443).

The spelling of 222221211212221 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twelve thousand, two hundred twenty-one".